// Copyright 2016 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef DRACO_COMPRESSION_POINT_CLOUD_ALGORITHMS_FLOAT_POINTS_TREE_DECODER_H_
#define DRACO_COMPRESSION_POINT_CLOUD_ALGORITHMS_FLOAT_POINTS_TREE_DECODER_H_

#include <memory>

#include "draco/compression/config/compression_shared.h"
#include "draco/compression/point_cloud/algorithms/point_cloud_compression_method.h"
#include "draco/compression/point_cloud/algorithms/point_cloud_types.h"
#include "draco/compression/point_cloud/algorithms/quantize_points_3.h"
#include "draco/core/decoder_buffer.h"

namespace draco {

// Decodes a point cloud encoded by PointCloudTreeEncoder.
class FloatPointsTreeDecoder {
  public:
    FloatPointsTreeDecoder();

    // Decodes a point cloud from |buffer|.
    template <class OutputIteratorT>
    bool DecodePointCloud(DecoderBuffer *buffer, OutputIteratorT &out);
    template <class OutputIteratorT>
    bool DecodePointCloud(DecoderBuffer *buffer, OutputIteratorT &&out);
    // Initializes a DecoderBuffer from |data|, and calls function above.
    template <class OutputIteratorT>
    bool DecodePointCloud(const char *data, size_t data_size,
                          OutputIteratorT out) {
        if (data == 0 || data_size <= 0)
            return false;

        DecoderBuffer buffer;
        buffer.Init(data, data_size);
        buffer.set_bitstream_version(kDracoPointCloudBitstreamVersion);
        return DecodePointCloud(&buffer, out);
    }

    uint32_t quantization_bits() const {
        return qinfo_.quantization_bits;
    }
    uint32_t compression_level() const {
        return compression_level_;
    }
    float range() const {
        return qinfo_.range;
    }
    uint32_t num_points() const {
        return num_points_;
    }
    uint32_t version() const {
        return version_;
    }
    std::string identification_string() const {
        if (method_ == KDTREE) {
            return "FloatPointsTreeDecoder: IntegerPointsKDTreeDecoder";
        } else {
            return "FloatPointsTreeDecoder: Unsupported Method";
        }
    }

  private:
    bool DecodePointCloudKdTreeInternal(DecoderBuffer *buffer,
                                        std::vector<Point3ui> *qpoints);

    static const uint32_t version_ = 3;
    QuantizationInfo qinfo_;
    PointCloudCompressionMethod method_;
    uint32_t num_points_;
    uint32_t compression_level_;
};

template <class OutputIteratorT>
bool FloatPointsTreeDecoder::DecodePointCloud(DecoderBuffer *buffer,
        OutputIteratorT &&out) {
    OutputIteratorT local = std::forward<OutputIteratorT>(out);
    return DecodePointCloud(buffer, local);
}

template <class OutputIteratorT>
bool FloatPointsTreeDecoder::DecodePointCloud(DecoderBuffer *buffer,
        OutputIteratorT &out) {
    std::vector<Point3ui> qpoints;

    uint32_t decoded_version;
    if (!buffer->Decode(&decoded_version))
        return false;

    if (decoded_version == 3) {
        int8_t method_number;
        if (!buffer->Decode(&method_number))
            return false;

        method_ = static_cast<PointCloudCompressionMethod>(method_number);

        if (method_ == KDTREE) {
            if (!DecodePointCloudKdTreeInternal(buffer, &qpoints))
                return false;
        } else {  // Unsupported method.
            fprintf(stderr, "Method not supported. \n");
            return false;
        }
    } else if (decoded_version == 2) {  // Version 2 only uses KDTREE method.
        if (!DecodePointCloudKdTreeInternal(buffer, &qpoints))
            return false;
    } else {  // Unsupported version.
        fprintf(stderr, "Version not supported. \n");
        return false;
    }

    DequantizePoints3(qpoints.begin(), qpoints.end(), qinfo_, out);
    return true;
}

}  // namespace draco

#endif  // DRACO_COMPRESSION_POINT_CLOUD_ALGORITHMS_FLOAT_POINTS_TREE_DECODER_H_
